* {
  margin: 0;
  padding: 0;
}

ul, ol, li {
  list-style: none;
}

a, a:active, a:hover, a:link {
  text-decoration: none;
  color: #333;
}

input, button, select, textarea {
  outline: none;
}

img {
  width: 100%;
  height: 100%;
  display: block;
}

/* 头部内容样式 */
.header {
  width: 1200px;
  height: 60px;
  background-color: skyblue;
  margin: 0 auto;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 30px;
  font-weight: 700;
  color: #fff;
}

.header > p {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: 30px;
  font-size: 20px;
  display: none;
}

.header > p.active {
  display: block;
}
